Cisco Talos says the VPNFilter malware currently infecting hundreds of thousands of endpoint devices is going after more devices than they initially thought.

The VPNFilter malware surfaced at the end of May and had targeted at least 500,000 routers and storage devices produced by Linksys, Microtik, Netgear, QNAP, and TP-Link.

This week researchers says the malware is targeting even more home-office network and network-attacked storage devices, including ASUS, D-Link, Huawei, Ubiquiti, Upvel, and ZTE.

Researchers say the malware also has new capabilities that allow it to inject malicious content into web traffic as it passed through an infected device.

“ The new module allows the actor to deliver exploits to endpoints via a man-in-the-middle capability (e.g. they can intercept network traffic and inject malicious code into it without the user's knowledge). With this new finding, we can confirm that the threat goes beyond what the actor could do on the network device itself, and extends the threat into the networks that a compromised network device supports,” they state.

“Additionally, we've discovered an additional stage 3 module that provides any stage 2 module that lacks the kill command the capability to disable the device. When executed, this module specifically removes traces of the VPNFilter malware from the device and then renders the device unusable.”

Cisco Talos says it will continue to monitor the VPNFilter threat and work with partners to understand it.